Question

In amplitude modulation, the amplitude of the carrier signal is 28 V and the modulation index is 0.4. The amplitude of the side bands is: 
 

• A. 7 V
• B. 5.6 V
• C. 11.2 V
• D. 14 V

Hint:

Remember, the amplitude of sidebands in AM is always half the product of the modulation index and the carrier amplitude.

Answer 1

The Correct Option is B

In amplitude modulation, the amplitude of each sideband is given by: \[ {Amplitude of side bands} = {Modulation index} \times \frac{{Amplitude of carrier signal}}{2} \] Given that the modulation index \( m = 0.4 \) and the carrier signal amplitude \( A_c = 28 \, {V} \): \[ {Amplitude of side bands} = 0.4 \times \frac{28}{2} = 0.4 \times 14 = 5.6 \, {V} \]